Question

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Answer 1

1a) x=40°

2a) x=30°

Explanation:

Use the fact that the sum of the angles of a triangle is always 180°.

So for 1a), x + x+40 + x+20 = 180

Simplify to

3x + 60 = 180

3x = 120

x = 40

apply the same logic to all the others.

For circles, the sum of the angles is 360°, so for 2b)

5x+3x+4x = 360 =>

12x = 360

x = 30°